A mover pulls a crate on a smooth warehouse floor with a constant force represented…
PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A mover pulls a crate on a smooth warehouse floor with a constant force represented (in newtons) by F=5i+3j−2k. During the pull the crate is displaced (in metres) through d=2i−6j+4k.
(i) Find the magnitude of the force acting on the crate.
(ii) Calculate the work done by the force during the given displacement.
(iii) If the force acts through a second displacement 2d, determine the additional work done.
(iv) Comment on the sign of the work obtained in part (ii) and its physical implication for the motion of the crate.